Google has proven in the past that its scale means that something like a small shift in shade can have big consequences. In the early days, Google tested 40 different shades of blue for its links and the winning hue helped it reel in an extra $200 million a year in ad revenue.

Some users are are saying that the change makes it harder to differentiate between which links they’ve clicked and which they haven’t.

Besides trying out black links, Google’s experimenting with different shades of blue as well. Business Insider’s Rob Price says that he’s been seeing a lighter blue than usual when not logged into his Chrome browser:

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Rob Price

Here are some of the thoughts and reactions that have flooded Twitter over the past few days: